FLAG_PRIVILEGED disappears if privileged app is updated and rebooted

Since Kitkat, an app pre-loaded under /system/priv-app/ has
FLAG_PRIVILEGED. However, if the app updated and the device
rebooted, privileged flag is unset from pkgFlags. This patch
fix issue to assign privileged flag when scanning the updated
packages.

Bug: 12640283

Change-Id: Ic24b5882f65dabdfae9cc39da3d68661bed4fc31
Fixed upgrading from forward-lock application to system application

Fixes the case when the app on system is newer than the
currently installed. Something that can happen e.g. after
a FOTA update.

Change-Id: I102e9cdd5693d5e66667c0c8989dc2643c72dd16